feat: Add Phase 4 advanced metrics and components

- Add advanced metrics dashboard with trade analytics
- Add new trading components (EntryTypeAnalysis, MultiDayPositionTracker, NewsEventTracker, etc.)
- Add strategy mode selector and trend confirmation
- Add risk automation panel and slippage correlation analysis
- Add daily trading plan enhancements with modal components
- Add custom hooks (useApi, useLocalStorage, useAdvancedTradeMetrics)
- Add broker service integration and trading API
- Add test setup and vitest configuration
- Include parquet data files for live market data
- Add comprehensive documentation in docs/ folder

backend/app/services/metals/goldprice.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from typing import Optional
+
+import httpx
+
+GOLDPRICE_URL_TEMPLATE = "https://data-asg.goldprice.org/dbXRates/{currency}"
+DEFAULT_CURRENCY = "USD"
+HEADERS = {
+    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0 Safari/537.36",
+    "Accept": "application/json",
+}
+
+
+async def fetch_goldprice_quote(currency: str = DEFAULT_CURRENCY) -> Optional[dict]:
+    url = GOLDPRICE_URL_TEMPLATE.format(currency=currency.upper())
+    async with httpx.AsyncClient(timeout=10.0, headers=HEADERS) as client:
+        response = await client.get(url)
+        response.raise_for_status()
+        data = response.json()
+
+    items = data.get("items") or []
+    if not items:
+        return None
+
+    quote = items[0]
+    xau_price = quote.get("xauPrice")
+    if xau_price is None:
+        return None
+
+    return {
+        "price": float(xau_price),
+        "change": float(quote.get("chgXau") or 0.0),
+        "change_percent": float(quote.get("pcXau") or 0.0),
+        "previous_close": float(quote.get("xauClose") or 0.0),
+        "timestamp_ms": int(data.get("ts") or 0),
+    }